how do i fix my electrics on my scooter?

iv got a peugeot ludix blaster 50 and the electrics work, when the bike is started off the kick start with no battery in it, but when i hook up the battery charger to the wires nothing happens. is it something wrong with the wires or something else electric, or simply bcoz thers no battery. i wouldnt of fort it would matter about the battery bcoz the charger is still putting out the power